The word 'viper' is correct and usable in written English.
You can use the word "viper" to refer to a venomous snake, found in many parts of the world. For example: "The Eastern Diamondback Viper is one of the most dangerous snakes in the United States."
Once, on the eve of another Arab war, he had to fight an enormous viper, eventually beating its head to pulp on the sand; it was, for him, a metaphor of the job to be done.
In a paper published recently by Toxicon, they report how a protein called eristostatin, which can be extracted from the venom of the Asian sand viper, helps people's immune systems fight malignant melanoma.
But Mr Correa wants nothing to do with the Congress or other politicians (he called Mr Gutiérrez a "viper").Mr Correa is armed with oil revenues.
He vowed to fight for legal ways to undermine the ruling.The case concerned a documentary called "Hillary: The Movie", which portrays Mrs Clinton as a lying, power-hungry viper.
Tirofiban, for instance, is a modified version of another anticoagulant in this case from the venom of the African saw-scaled viper.
The saw-scaled viper may be the deadliest of all snakes, since scientists believe it to be responsible for more human deaths than all other snake species combined.
Snakes are numerous, among them the poisonous krait, cobra, and Russell's viper.
Cerastes, genus of venomous, desert-dwelling snakes of the viper family, Viperidae.
There are two species, the horned viper (C. cerastes), which usually has a spinelike scale above each eye, and the common, or Sahara, sand viper (C. vipera), which lacks these scales.
Vipers range in length from less than 25 cm (10 inches) in the Namaqua dwarf viper (Bitis schneideri) of southern Africa to more than 3 metres (10 feet) in the bushmaster (Lachesis muta) of the Amazon basin and Central America.
It is the only pit viper in the Americas to lay eggs (instead of bearing live young), and females may remain with the eggs for a time before they hatch.
